EP1668425A1 - Verfahren und vorrichtung zum steuern der umlaufgeschwindigkeit eines endlosen bandes sowie anordnung zum erzeugen einer bremskraft auf ein endloses band - Google Patents
Verfahren und vorrichtung zum steuern der umlaufgeschwindigkeit eines endlosen bandes sowie anordnung zum erzeugen einer bremskraft auf ein endloses bandInfo
- Publication number
- EP1668425A1 EP1668425A1 EP04764556A EP04764556A EP1668425A1 EP 1668425 A1 EP1668425 A1 EP 1668425A1 EP 04764556 A EP04764556 A EP 04764556A EP 04764556 A EP04764556 A EP 04764556A EP 1668425 A1 EP1668425 A1 EP 1668425A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- transfer belt
- endless belt
- belt
- braking force
- speed
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G15/00—Apparatus for electrographic processes using a charge pattern
- G03G15/01—Apparatus for electrographic processes using a charge pattern for producing multicoloured copies
- G03G15/0142—Structure of complete machines
- G03G15/0147—Structure of complete machines using a single reusable electrographic recording member
- G03G15/0152—Structure of complete machines using a single reusable electrographic recording member onto which the monocolour toner images are superposed before common transfer from the recording member
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G15/00—Apparatus for electrographic processes using a charge pattern
- G03G15/01—Apparatus for electrographic processes using a charge pattern for producing multicoloured copies
- G03G15/0142—Structure of complete machines
- G03G15/0147—Structure of complete machines using a single reusable electrographic recording member
- G03G15/0152—Structure of complete machines using a single reusable electrographic recording member onto which the monocolour toner images are superposed before common transfer from the recording member
- G03G15/0168—Structure of complete machines using a single reusable electrographic recording member onto which the monocolour toner images are superposed before common transfer from the recording member single rotation of recording member to produce multicoloured copy
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G2215/00—Apparatus for electrophotographic processes
- G03G2215/01—Apparatus for electrophotographic processes for producing multicoloured copies
- G03G2215/0151—Apparatus for electrophotographic processes for producing multicoloured copies characterised by the technical problem
- G03G2215/0154—Vibrations and positional disturbances when one member abuts or contacts another member
Definitions
- a second aspect of the invention relates to an arrangement for controlling the circulating speed of an endless belt.
- This arrangement contains an endless belt that is guided over at least two rollers.
- a drive unit drives the belt over at least one of the rollers at a preset first rotational speed.
- a braking unit applies a braking force directly into the belt, by means of which the belt is braked to a second rotational speed.
- FIG. 12 shows the printing unit according to FIGS. 4 to 9, the transfer belt being pivoted to the paper web and to the cleaning unit in the operating phase shown and an additional pressure roller being pivoted to the paper web at the pressure point;
- Figure 15 shows an arrangement for braking the transfer belt according to a first embodiment of the invention
- Figure 16 shows an arrangement for braking the transfer belt according to a second embodiment of the invention
- Figure 18 shows an arrangement for braking the transfer belt according to a fourth embodiment of the invention
- Figure 19 shows an arrangement for braking the transfer belt according to a fifth embodiment of the invention
- the drive roller 26 is connected to a drive motor, not shown, and drives the photoconductor belt 22 in the direction of the arrow 23. Furthermore, the printing unit contains a belt drive for guiding a transfer belt 17.
- the belt drive has a drive roller 1 - as well as guide and deflection rollers 1, 5a, 5b, 7, 9, 11, 13, 16. The rollers 5a, 5b and 16 are stationary in the The tape drive is arranged, the guide and deflection rollers 7, 9, 11, 13 being connected to one another via a lever arrangement with levers 6, 8, 10, 12, 15 such that a pivoting movement of the transfer belt 17 against a paper web 19 and a cleaning unit 21 takes place with the belt tension of the transfer belt 17 remaining the same. Furthermore, two drive units, not shown, are provided for executing the pivoting movements. The transfer belt 17 is driven in the direction of arrow 18 with the aid of the drive roller 1, which is connected to a drive unit (not shown).
- a load-dependent slip occurs on the drive roller 1.
- the different load conditions occur, in particular, by pivoting the transfer belt 17 onto the paper web 19, pivoting the transfer belt 17 against the cleaning unit 21, activating the cleaning coronron 21c and pivoting a pressure roller 20 in the transfer area between the transfer belt 17 and paper web 19.
- the rollers 5a and 5b are arranged directly next to a transfer printing point between the photoconductor belt 22 and the transfer belt 17 and continuously press the transfer belt 17 against the photoconductor belt 22 guided by the deflection roller 24 at the transfer printing point.
- two toner images 29c, 29d are arranged on the photoconductor belt 22, a first part of the toner image 29c having already been printed onto the transfer belt 17 and the developer unit 28 subsequently colors the latent printed image present as a charge image on the photoconductor belt 22 further to the toner image 29d ,
- the toner images 29b and 29a previously colored by the developer unit 28 have already been transferred to the transfer belt 17 and are transported in the direction of the arrow 18 with the transfer belt 17 on its surface to a transfer location where they are then transferred from the transfer belt 17 to the paper web 19 are transmitted.
- the transfer belt 17 is pivoted onto a cleaning unit 21, so that the cleaning unit 21 is activated.
- FIG. 3 shows the printing unit according to FIGS. 1 and 2, the transfer belt 17 being pivoted onto both the paper web 19 and the cleaning unit 21, so that the toner images 29b to 29f on the transfer belt 17 are transferred to the paper web 19.
- the paper web 19 is accelerated to the conveying speed shortly before the transfer belt 17 is pivoted and moved in the direction of the arrow 30.
- the swiveling lever mechanism is moved with the aid of a second drive unit such that the transfer belt 17 comes on in particular by guiding the roller 9.
- the cleaning unit 21 is pivoted after at least part 'of the toner image 29h first generated has been printed onto the paper web 19 and at least the point of the transfer belt 17 at which the front edge of the toner image 29h has been found reaches the cleaning area of the cleaning unit 21.
- the cleaning unit 21 contains an unloading corotron 21c, through the high-voltage corotron of which the toner residues located on the transfer belt are discharged.
- FIG. 3 shows toner images 29a, 29b, 29c, 29d, 29e, 29f, 29g, 29h which have been colored one after the other with the aid of the developer unit 28, the toner image 29a being colored first and the toner image 29h being colored last.
- the toner image 29h has not yet been completely generated and is subsequently completed by coloring a charge image present on the ink conductor tape 22.
- FIG. 4 shows a printing unit similar to the printing unit according to FIGS. 1 to 3, it being possible to use the printing unit according to FIG. 4 to produce a two-tone toner image on the paper web 19.
- the same elements have the same reference symbols.
- four toner images 29a to 29d have been generated with the aid of the developer unit 28, the toner images being colored with black toner material.
- the printing unit is shown in FIG 4, wherein the '' toner image 29d completely lerritt using DER E twick- has been generated 28 and is almost completely transferred from the photoconductor belt 22 to the transfer belt 17th
- a further toner image 32a has subsequently been generated on the photoconductor belt 22 with the aid of the activated developer unit 31 with the developer unit 28 deactivated, the character generator having previously generated a corresponding charge image on the photoconductor belt 22.
- only a first part of an entire toner image 32a is colored by the developer unit 31 with red toner material.
- the further printed image of the toner image 32a is already present as a charge image on the photoconductor belt 22 and is therefore present as a latent printed image, which is then colored with red toner material using the developer unit 31.
- FIG. 7 a further toner image 33a has been produced by " coloring a charge image with the aid of the developer unit 28 with black toner material on the photoconductor belt 22.
- FIG. 8 shows the printing unit according to FIGS. 4 to 7, a further part of the toner images 29a and 32a having been transferred to the paper web 19.
- the point at which the front edge of the toner images 29a and 32a was located has reached the cleaning area of the cleaning unit 21, the pivot levers 6, 8 and 10 in this way at the latest when the transfer belt 17 arrives in the cleaning area of the cleaning unit 21 'are moved with the aid of a drive unit (not shown) such that the transfer belt 17 is pivoted onto the cleaning unit 21, the positions of the pivot levers 12 and 15 not being changed when the transfer belt 17 is pivoted onto the cleaning unit 21.
- both “when pivoting the "Transfer belt 17 to the paper web 19 and the belt tension of the transfer belt 17 does not change when the transfer belt 17 is pivoted onto the cleaning unit 21.
- FIG. 9 shows the printing unit according to FIGS. 4 to 8, the entire toner images shown in FIG. 8, ie printed one above the other, being transferred to the paper web 19. Finally, the rear edge of the printed images 29d / 32d was transferred to the paper web 19.
- the transfer belt 17 has been pivoted away from the paper web 19 by means of the drive device (not shown) by moving the levers 10, 12 and 15. Both the unloading corotron 21c and the cleaning brush 21b are still activated, the transfer belt 17 still being pivoted to the cleaning unit 21.
- the cleaning brush 21b, the cleaning corotron 21c remain activated at least until the point on the transfer belt -17 at which. the trailing edges of the toner images 29d / 32d have been on the transfer belt 17, have completely passed through the cleaning area of the cleaning unit 21.
- the toner image 33a already generated in the operating status or operating state shown in FIG.
- FIG. 10 shows the printing unit according to FIGS. 1 to 3, whereby, in contrast to the operating states shown in FIGS. 1 to 3, the printing unit is shown in an operating state in which print images 29a to 29d are transported on the photoconductor belt 22 and the transfer belt 17 are, wherein the transfer belt 17 is pivoted both from the cleaning unit 21 and from the paper web 19.
- a load state of the transfer belt 17 is thus similar to the load state according to FIG. 1 in FIG. 10 shown, in contrast to the load state according to Figure 1, toner images 29a to 29d are generated or transported.
- the toner images 29a, 29b and 29c transmitted from the photoconductor belt 22 to the transfer belt 17 have thus been transmitted at a higher first rotational speed Vi of the transfer belt 17 according to FIG.
- the toner image 29c in FIG. 3 is transferred to the paper web 19 and to the cleaning unit 21 at least this toner image 29c at a third low rotational speed v 3 of the transfer belt 17 when the transfer belt 17 is pivoted ".
- the rotational speed of the photoconductor belt 22 is constant regardless of the rotational speed of the transfer belt 17.
- the toner images are not compressed at the first circulation speed V of the transfer belt 17 at the transfer location between the photoconductor belt 22 and the transfer belt 17, ie the length of the toner images on the photoconductor belt 22 corresponds to the subsequent length of the same toner images on the transfer belt 17. If the toner images are removed from the photoconductor belt 22 transferred to the transfer belt 17 at an average rotational speed v 2 , the toner image is compressed by a first amount during the transfer and is compressed by a second amount when the toner image is transferred at the third low rotational speed v 3 of the transfer belt 17.
- the toner images are compressed in the range between one thousandth and several millimeters. This works also on the length of the print image subsequently produced on the paper web 19 and its position on the paper web 19.
- the transfer belt 17 rotates at a first high rotational speed vi, which is additionally identified in FIG. 10 with the reference symbol 34.
- the speed v of the photoconductor band 22 is additionally identified by the reference number 35.
- FIG. 11 shows the printing unit according to FIG. 10, the print images 29a to 29d being generated in the same way as in FIG. 10. whereby the transfer belt 17 is pivoted at least when the toner image 29c is transferred from the photoconductor belt to the transfer belt 17 using the levers 6, 8 and 10 to the cleaning unit -21.
- the transfer belt 17 is pivoted at least when the toner image 29c is transferred from the photoconductor belt to the transfer belt 17 using the levers 6, 8 and 10 to the cleaning unit -21.
- FIG. 12 shows the printing unit according to FIGS. 4 to 9, the transfer belt 17 being pivoted both to the cleaning unit 21 and to the paper web 19. Furthermore, the pressure roller 20 is pivoted from below onto the paper web 19. As a result, the transfer belt 17 rotates at a low third rotational speed v, which is additionally identified in FIG. 12 by reference number 35.
- FIG. 13 shows a round-trip time-time diagram 40 as a screen printout of evaluation software for evaluating measured values determined on the printing unit according to one of the printing units shown in FIGS. 1 to 12.
- the current time is shown on the abscissa and the orbital time of a belt revolution of the transfer belt 17 is shown on the ordinate.
- the rotational speeds vi, v 2 and v 3 of the transfer belt 17 have been determined during the operating states shown in FIGS. 10 to 12.
- the transfer belt 17 has neither mechanical contact with the cleaning unit 21 nor mechanical contact with the paper web 19.
- the transfer belt 17 has a round trip time of 1788.51 ms, which corresponds to the round trip speed i.
- the transfer belt 17 has mechanical contact to the activated cleaning unit 21, but no mechanical contact to the paper web 19.
- the transfer belt 17 has a round trip time of 1788.58 ms, which corresponds to a speed v 2 .
- the transfer belt 17 has both mechanical contact with the cleaning unit 21 and mechanical contact with the paper web 19.
- the transfer belt 17 has a round trip time of 1788.67 ms and thus a speed v 3 .
- the rotational speed of the transfer belt 17 varies between the speeds vi to v 3 .
- the rotational speed of the photoconductor belt 22 always remains constant during the operating phases 41a, 4b, 42 and -43.
- the orbital period of the transfer belt 17 results from the quotient of the length of the transfer belt 17 and the rotational speed of the transfer belt 17.
- the relative speed deviation in the printing units according to FIGS. 1 to 12 is less than 2/1000 of the nominal rotational speed. However, in practice, especially in two and multi-color printing, it has visible effects. With the help of the printing units according to FIGS. 1 to 12, one or more pages with a total length of up to 1650 mm can be produced in an exemplary constructive embodiment of these printing units.
- the second toner image transferred from the photoconductor belt 22 to the transfer belt 17 is compressed by 1 ° a during this transfer relative to the first toner image, so that in "congruent top of both toner images the side end of the second toner image ends earlier than the side end of the first toner image.
- the second toner image is 1.65 mm shorter than the first toner image ( 1 V. of 1650 mm writing length of the first round).
- the human eye recognizes a line set with several printed images of different colors printed on top of each other very clearly and finds this disturbing, whereby this offset is generally referred to in printing technology as a color fringe.
- an offset of 2/100 mm is clearly recognizable and is perceived as annoying.
- the speed change may be a maximum of 0.012 SO, this value being calculated as follows:
- FIGS. 14a to 14d show the effects of the upsetting of the printed images at the transfer printing location between the photoconductor belt 22 and the transfer belt 17 on the basis of schematically illustrated printed pages 48a to 48d.
- FIG. 14a shows five printed images of printed pages that are generated one after the other and transferred to the transfer belt 17, which are then reprinted onto an endless paper web 45.
- the second color printout which is labeled 48b in FIG. 14b, was transferred to the transfer belt 17 after the "pivoting" of the cleaning unit 21 at a rotational speed v of the transfer belt 17, the printed pages shown in FIG.
- the physical length of a page on the paper web 45 is indicated and with the " dimensions 47a to 47d the physical length of the toner image transferred to the transfer belt 17 is indicated, which after collecting the toner images is transferred to the transfer belt 17 onto the paper web 45.
- the physical side lengths are each indicated in FIGS. 14a to 14d " by vertical dashed lines.
- FIGS. 14a and 14b illustrate the offset of the toner images produced or re-printed at the rotational speed vi in relation to the toner images produced or re-printed at the speed v 2 , with the increasing inclination the initially vertical semicolon line at subsequent print image beginnings and print image ends shows the offset between the individual print images.
- FIG. 14b also shows that the third printed image is already printed on the paper web 45 in front of the physical page edge, which means that in a subsequent cutting process part of the toner image of this printed page is cut off. In the case of the fourth and fifth printed pages printed subsequently, larger parts of the printed page are then cut off, parts of the subsequent printed page being contained on the previous printed page after being cut.
- printing units are similar to the printing units according to FIGS. 1 to 12 shown.
- the same elements have the same reference symbols.
- Arranged on the inside of the transfer belt 17 is a rounded metal plate over which the transfer belt 17 is guided when the transfer belt 17 is driven by means of the drive roller 1.
- the metal plate 55 is supplied with a high voltage that can be set to the ground potential of the printer. Due to the high voltage, a braking force 58 is generated in the transfer belt 17, which acts directly on the transfer belt 17, whereby the transfer belt 17 is braked.
- FIG. 15 a diagram 57 is shown in FIG. 15, in which a graph shown with the aid of a dotted line shows the voltage curve of the high voltage and with a graph shown with a solid line the braking force generated by the high voltage with which the transfer belt 17 is braked.
- the course of the high voltage over time is controlled as a function of the different load states already described in such a way that a substantially constant rotational speed of the transfer belt 17 is brought about.
- the transfer belt 17 is pivoted away both from the paper web 19 and from the cleaning unit 21, so that the transfer belt 17 is braked to a constant, low rotational speed v 4 with the maximum braking force required.
- a high-voltage source with a constant high voltage is provided in FIG. 16, the high-voltage source 60 of FIG. 16 supplying the high voltage to the metal plate 55 in the form of voltage pulses of different pulse widths or pulse widths.
- a voltage is also referred to as a pulsed voltage.
- the pulse widths are increased and the pauses between the individual pulses are reduced.
- a lower one If the braking effect is required, the pulse width of the individual pulses is reduced and the pauses between the pulses are increased.
- This dependency of the braking force on the pulse width is also shown in diagram 61, the voltage pulses being represented by hatched areas and the resulting braking force using a graph shown with a solid line.
- the printing unit shown in FIG. 17 does not have a metal plate 55, but rather a plurality of strip-shaped metal plates 65a to 65d which are arranged next to one another and insulated from one another in the conveying direction of the transfer belt 17, each of which is optionally available via a switch 66a to 66d a constant high voltage generated by a high voltage source 67 • is supplied.
- a switch 66a to 66d a constant high voltage generated by a high voltage source 67 • is supplied.
- the dependence of the braking force on the effective area is likewise in the force -Time diagram 68 shown, the metal plate 65a forming the surface segment AI, the metal plate 65b the surface segment A2, the metal plate 65c -the surface segment A3 and the metal plate 65d forming the surface segment A4, which then changes depending on the surface of the individual elements the transfer belt 17 acting total braking force, as shown in the diagram 68th using the footnotes of the surface segments that supplies the high-voltage surface segments are indicated.
- the metal plates 65c and 65d with high voltage by closing the switches 66c and 66d.
- FIG. 18 shows the arrangement for braking the transfer belt 17 similar to the arrangement according to FIG. 17, with no high voltage of the high voltage source 67 being applied in a state in which the metal plates 65a to 65d leads but is supplied via a circuit arrangement ground potential. Floating potentials of this metal plate 65a to 65d are thereby avoided.
- the braking effect of this arrangement essentially corresponds to the braking effect of the arrangement according to FIG. 17, as is also shown in diagram 68.
- FIG. 19 shows an arrangement for generating a braking force which acts directly on the transfer belt 17.
- the arrangement of the metal plates 65a to 65d essentially corresponds to the arrangement according to FIGS. 17 and 18.
- the individual metal plates 65a to 65d can optionally be supplied with a first high voltage generated by a high voltage source 67 or a second high voltage generated by a high voltage source 71.
- a potential difference which differs from the ground potential can be generated between the individual metal plates 65a to 65d, in particular one of the high-voltage sources 67 and 71 being able to generate a high voltage which is negative to the ground potential.
- a braking force is generated by supplying the high voltage source 67 to the individual metal plates 65a to 65d, the area-dependent braking force being shown in diagram 68, which is shown in diagrams 68 according to FIGS 18 essentially coincides.
- FIG. 20 shows three diagrams 75, 76 and 77, diagram 75 showing the braking forces acting on the transfer belt 17 due to the different load conditions and diagram 76 showing the braking force generated by one of the braking devices according to FIGS Time is shown.
- FIG. 17 also shows a diagram 77 in which the sum of the braking forces from the diagrams 75 and 76 is shown, with the brake arrangement controlled as a function of the load. ne constant resulting braking force 78 is generated.
- the braking force generated by the cleaning unit 21 is identified with F Re ⁇ , the braking force resulting from the pivoting of the transfer belt 17 onto the paper web 19 with Fp a pi er , the pivoting transfer band 17 against the paper web 19 and simultaneous pivoting of the transfer belt 17 to the cleaning unit 21 generated braking force with F Re i + ap .
- the resulting braking force 78 can be kept constant over the entire time period, ie during the different operating phases with the different load conditions, as a result of the brake arrangements shown, as a result of which the transfer belt 17 has a constant rotational speed.
- the different lengths of the toner images are thus effectively avoided. Toner images are produced with an exact preset length. Even with multi-color printing, exactly congruent toner images can be produced, thereby avoiding a color image border.
- FIG. 21 shows a brake arrangement according to FIGS. 15 and 16, "the metal plate 5.5, in contrast to FIGS. 15 and 16, being supplied with a high voltage generated at a high voltage source 80.
- the high voltage source 80 can output an adjustable, variable high voltage, the level of the high voltage output being adjustable by means of a microprocessor 81 connected to a control input of the high voltage source 80.
- the microprocessor 81 also controls drive motors 83a and 83b for executing the pivoting movements of the transfer belt 17 to the cleaning unit 21 and to the paper web 19 with the aid of the lever mechanism of the levers 6, 8, 10, 12, 15.
- the outputs of the microprocessor 81 for controlling the drive motors 83a and 83b are connected to power converters 82a, 82b which convert the control signals of the microprocessor 81 into motor control signals for driving the motors 83a and convert 83b, with motors 83a and 83b preferably being stepper motors.
- the motor 83a pivots the lever 6 and the motor 83b pivots the lever 10.
- the same microprocessor 81 controls the high voltage generating the braking effect and the swiveling movement of the transfer belt 17.
- the load changes generated by the swiveling movements can thus be very easily taken into account when determining the high voltage to be set and the braking force resulting therefrom, at the same time or, if necessary, before this time , for which a change in load occurs, a corresponding change in the braking force caused by the metal plate 55 - is generated in order to ensure the constant braking force 78 shown in FIG.
- FIG. 22 shows the brake arrangement according to FIG. 21, the high-voltage source 80 being controlled by a microprocessor 84 to which a setpoint 86 of the speed of the transfer belt 17 is supplied and with the aid of a sensor 85 for detection. an actual value of the circulating speed is supplied to the circulating speed of the transfer belt 17.
- the circulation time of the transfer belt 17 can also be detected with the aid of a suitable sensor arrangement, from which the circulation speed is then simply determined with the aid of the belt length of the endless belt.
- the microprocessor 84 carries out an actual value / setpoint comparison and, depending on the control deviation, generates an actuating signal that the microprocessor 84 supplies to the high-voltage source 80.
- the high voltage source 80 thus serves as an actuator of the control loop.
- FIGS. 23a to 23e each show the round trip times of the transfer belt 17 as a function of the set DC voltage.
- the effective area of the metal plate 55 is 545 cm 2 , the circulating speed vi at a high voltage of 0 kV is only 992 mm / s.
- the average round trip time is shown in FIGS. 23a to 23e in each case with the aid of a dash-dot line.
- no high voltage is applied to the metal plate 55, but there is a ground potential or " a potential corresponding to the ground potential.
- the average orbital circulation time is 1790.94 ms.
- FIG. 23b shows a diagram in which the Orbital period of the transfer belt 17 occurs when a high voltage of 0.4 kV is applied to the metal plate 55.
- the average orbital period of the transfer belt 17 is also 1790.94 ms.
- FIG. 23c shows the round trip time of the transfer belt 17 when the metal plate 55 is subjected to a high voltage of 0.80 kV.
- the round trip time of the transfer belt 17 is on average 1791.09 ms " .
- FIG. 23d shows the round trip time of the transfer belt 17 when a voltage of 1.2 kV is applied to the metal plate -55.
- the average round trip time is 1791.21 ms
- the average round trip time of the transfer band 17 is 1791.35 ms, as shown in FIG. 23e.
- FIG. 24 shows a round trip time / round speed voltage diagram, in which the change in the absolute round trip time and the change in the round trip time is shown as a function of the change in the voltage supplied.
- the graph shown with a dashed line indicates the change in the absolute round trip time and the graph shown with a solid line shows the change in the round trip time with increasing voltage.
- the metal plate 55 or the metal plates 65a to 65d is arranged on the inside of the transfer belt 17.
- the braking effect on the transfer belt 17 may be due to the fact that an electrical field is generated between the metal plate 55 or the metal plates 65a to 65d and the components of the printer which have a potential different from the potential of the metal plate 55, 65a to 65d that the transfer belt 17 is passed through.
- the metal plate 55, 65a to 65d is thus a capacitor plate.
- the electric field causes a temporary shift of charges in the transfer belt 17.
- the shift results in an accumulation of charges opposed to the charge of the capacitor plate in the transfer belt 17 to the metal plate 55, 65a to 65d.
- the charges in the transfer belt 17 are attracted by the charge on the capacitor plate 55, 65a to 65 with a force in accordance with Coulomb's law. "The transfer belt 17- is pulled towards or against the metal plate 55, 65a to 65d (ie capacitor plate) by this force.
- a braking force is generated independently of the rollers of the tape drive, which acts directly on the transfer belt 17.
- a further metal plate can be arranged essentially parallel to the metal plate 55, 65a to 65d, preferably at a preset distance from the transfer belt.
- the further metal plate then has a potential different from the potential of the metal plate 55, 65a to 65d, preferably ground potential, for generating the braking force.
- the metal plate 55, 65a to 65d can also be arranged on the outside of the transfer belt 17 at a distance from the transfer belt 17, so that a toner image 29 on the transfer belt 17 is not damaged by the metal plates 55, 65a to 65d.
- the high voltage sources 56, 60, 67, 71 can also generate an alternating voltage with which the plates 55, 65a to 65d are acted upon.
- the braking force generated by the supply of the high voltage acts directly and without a time delay on the transfer belt 17. This enables a very exact and precise control of the braking force.
- the metal plates 65a to 65d, 55 preferably extend over the entire width of the transfer belt 17. Due to the brake arrangements according to the invention, the transfer belt 17 and the plates 55, 65a to 65d are subject to very little wear.
- the surface which generates the braking force can also be subdivided transversely to the transfer belt 17 into segments which can be acted upon individually or in groups with high voltage of the same voltage level or different voltage levels.
- the metal plates 55, 65a to 65d can be simple metal plates, in particular metal plates which contain a stainless steel alloy, copper or a copper alloy or which contain an aluminum alloy or aluminum. Furthermore, the plates can be subjected to a surface treatment or provided with a coating. Alternatively, electrically conductive plastics can also be used as plate 55.
- the plates 55 are preferably provided with a smooth surface or with a suitable surface structure.
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Electrostatic Charge, Transfer And Separation In Electrography (AREA)
- Paper Feeding For Electrophotography (AREA)
- Controlling Rewinding, Feeding, Winding, Or Abnormalities Of Webs (AREA)
- Stopping Of Electric Motors (AREA)
- Control Of Electric Motors In General (AREA)
- Rollers For Roller Conveyors For Transfer (AREA)
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10345149A DE10345149A1 (de) | 2003-09-29 | 2003-09-29 | Verfahren und Vorrichtung zum Steuern der Umlaufgeschwindigkeit eines endlosen Bandes sowie Anordnung zum Erzeugen einer Bremskraft auf ein endloses Band |
PCT/EP2004/009582 WO2005040936A1 (de) | 2003-09-29 | 2004-08-27 | Verfahren und vorrichtung zum steuern der umlaufgeschwindigkeit eines endlosen bandes sowie anordnung zum erzeugen einer bremskraft auf ein endloses band |
Publications (2)
Publication Number | Publication Date |
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EP1668425A1 true EP1668425A1 (de) | 2006-06-14 |
EP1668425B1 EP1668425B1 (de) | 2008-05-07 |
Family
ID=34399022
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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EP04764556A Not-in-force EP1668425B1 (de) | 2003-09-29 | 2004-08-27 | Verfahren und vorrichtung zum steuern der umlaufgeschwindigkeit eines endlosen bandes sowie anordnung zum erzeugen einer bremskraft auf ein endloses band |
Country Status (5)
Country | Link |
---|---|
US (1) | US7643775B2 (de) |
EP (1) | EP1668425B1 (de) |
AT (1) | ATE394709T1 (de) |
DE (2) | DE10345149A1 (de) |
WO (1) | WO2005040936A1 (de) |
Families Citing this family (5)
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DE102005023462A1 (de) * | 2005-05-20 | 2006-11-23 | OCé PRINTING SYSTEMS GMBH | Vorrichtung und Verfahren zum beidseitigen Bedrucken eines Aufzeichnungsträgers mit Umlade- und Nachladevorrichtung |
DE102006025400B3 (de) * | 2006-05-31 | 2007-12-27 | OCé PRINTING SYSTEMS GMBH | Verfahren zum Drucken von Bildern auf einen Endbildträger nach dem elektrografischen Prinzip |
DE102006032703A1 (de) | 2006-07-14 | 2008-01-24 | OCé PRINTING SYSTEMS GMBH | Verfahren und Anordnung zum Erzeugen einer vorgegebenen Umlaufgeschwindigkeit eines endlosen bandförmigen Bildträgers |
DE102007008800A1 (de) * | 2007-02-22 | 2008-08-28 | OCé PRINTING SYSTEMS GMBH | Verfahren zum Drucken von aus Farbauszügen aufgebauten Farbbildern mit einem elektrografischen Druckgerät |
US7890035B2 (en) * | 2007-12-10 | 2011-02-15 | Avision Inc. | Image forming apparatus and image transferring method therefor |
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JPH067290B2 (ja) * | 1984-10-19 | 1994-01-26 | 日立工機株式会社 | ヒートロール送り制御方法 |
JPH0484183A (ja) * | 1990-07-26 | 1992-03-17 | Konica Corp | 画像形成装置 |
US5194896A (en) * | 1992-01-29 | 1993-03-16 | Eastman Kodak Company | Magnetic brake for pivotal device |
JP2887269B2 (ja) * | 1993-02-25 | 1999-04-26 | 富士ゼロックス株式会社 | 定着装置 |
JPH08231075A (ja) | 1994-11-22 | 1996-09-10 | Xerox Corp | 高精度速度制御装置及び方法 |
JP3528342B2 (ja) | 1995-07-12 | 2004-05-17 | 富士ゼロックス株式会社 | 画像形成装置及び画像形成装置の制御方法 |
JPH10142964A (ja) * | 1996-11-15 | 1998-05-29 | Minolta Co Ltd | 転写ベルト装置 |
CA2282846C (en) | 1997-03-03 | 2007-05-15 | Oce Printing Systems Gmbh | Printer and copier for performance-adjusted monochrome and/or chromatic, single-sided or both-sided printing of a recording medium |
JP3175633B2 (ja) * | 1997-05-06 | 2001-06-11 | 富士ゼロックス株式会社 | 画像形成装置 |
US6226481B1 (en) * | 1998-12-07 | 2001-05-01 | Ricoh Company, Ltd. | Image forming apparatus with control over developing unit during an idle running of an intermediate image transfer body |
JP2000197381A (ja) * | 1998-12-25 | 2000-07-14 | Seiko Epson Corp | Dcモ―タ制御装置及びdcモ―タ制御方法 |
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JP2000251349A (ja) | 1999-02-26 | 2000-09-14 | Sony Corp | テープ状記録媒体の静電制動機構および静電電極ならびにテープ状記録媒体の再生装置および再生方法 |
DE19942116C2 (de) | 1999-09-03 | 2002-01-10 | Oce Printing Systems Gmbh | Korotroneinrichtung mit kleinflächiger Gegenelektrode |
JP2001324858A (ja) * | 2000-03-10 | 2001-11-22 | Ricoh Co Ltd | 画像形成装置 |
US6771919B2 (en) * | 2001-07-18 | 2004-08-03 | Ricoh Company, Ltd. | Image forming apparatus with reduced variation of rotation speed of image carrier |
JP2003241469A (ja) * | 2002-02-15 | 2003-08-27 | Sharp Corp | 多色画像形成装置 |
JP4214365B2 (ja) * | 2002-03-18 | 2009-01-28 | 富士ゼロックス株式会社 | 画像形成装置 |
-
2003
- 2003-09-29 DE DE10345149A patent/DE10345149A1/de not_active Ceased
-
2004
- 2004-08-27 US US10/573,400 patent/US7643775B2/en not_active Expired - Fee Related
- 2004-08-27 EP EP04764556A patent/EP1668425B1/de not_active Not-in-force
- 2004-08-27 AT AT04764556T patent/ATE394709T1/de not_active IP Right Cessation
- 2004-08-27 DE DE502004007079T patent/DE502004007079D1/de active Active
- 2004-08-27 WO PCT/EP2004/009582 patent/WO2005040936A1/de active IP Right Grant
Non-Patent Citations (1)
Title |
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See references of WO2005040936A1 * |
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ATE394709T1 (de) | 2008-05-15 |
US7643775B2 (en) | 2010-01-05 |
DE502004007079D1 (de) | 2008-06-19 |
WO2005040936A1 (de) | 2005-05-06 |
DE10345149A1 (de) | 2005-04-28 |
EP1668425B1 (de) | 2008-05-07 |
US20070189806A1 (en) | 2007-08-16 |
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